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7.2 Second-Order Properties of Multivariate Time Series 233<br />

The linear process (7.2.12) is stationary (Problem 7.2) with mean 0 and covariance<br />

function<br />

∞<br />

Ɣ(h) Cj+h| Cj ′ , h 0, ±1,.... (7.2.13)<br />

j−∞<br />

An MA(∞) process is a linear process with Cj 0 for j

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